Both of these are valid notation. Json spec also says that numbers are floats, so it’s perfectly acceptable to denote them this way. This is why currency should never use a number notation, and instead use a string. If it must be precise, use a string.
But the second you go international that goes out the window. There are currencies with 3 and 4 digits of precision. There are currencies that are integers. Keeping track of that is a nightmare using a numerical value. It’s safest just to represent it as a string.
Both of these are valid notation. Json spec also says that numbers are floats, so it’s perfectly acceptable to denote them this way. This is why currency should never use a number notation, and instead use a string. If it must be precise, use a string.
Or, use the smallest denomination. In the US, that’s typically tenths of a penny. So, $1 = 1000. Then everything uses integer arithmetic.
Of course, JS doesn’t actually have integers, so yeah, strings are probably best.
But the second you go international that goes out the window. There are currencies with 3 and 4 digits of precision. There are currencies that are integers. Keeping track of that is a nightmare using a numerical value. It’s safest just to represent it as a string.